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Long wait pays off for Hosszu

Hungary's Katinka Hosszu obliterated the world record to end her long wait for an Olympic victory on an exhilarating first day of swimming at the Rio Games.

Hosszu, five times a world champion but without a medal from three previous Olympics, bettered the world record by 2.07 seconds in the final of the women's 400 metres individual medley.

Having suffered a nightmare Olympics in London, where she started as a hot medal prospect but came away empty-handed, Hosszu led from start to finish and stormed down the final length with the crowd roaring her on.

"It's just crazy that I've been able to swim two seconds faster than anyone ever, ever did. It's just crazy," said the Hungarian, who will also contest the 200 IM, 200 butterfly and 100 and 200 backstroke.

The day's first record went to Britain's Adam Peaty, who broke his own world mark of 57.92 in the heats of the 100 breaststroke when he clocked 57.55.

Tipped to become the first British man to win an Olympic gold since 1988, he then swam 57.62 in the semi-finals.

In the first of four evening finals, Japan's Kosuke Hagino won the men's 400m individual medley, edging out Chase Kalisz of the US, who had been fastest in the heats, and Japan's Daiya Seto.